EP0107044B1 - Anneau de broyage pour broyeur de charbon - Google Patents

Anneau de broyage pour broyeur de charbon Download PDF

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Publication number
EP0107044B1
EP0107044B1 EP83109386A EP83109386A EP0107044B1 EP 0107044 B1 EP0107044 B1 EP 0107044B1 EP 83109386 A EP83109386 A EP 83109386A EP 83109386 A EP83109386 A EP 83109386A EP 0107044 B1 EP0107044 B1 EP 0107044B1
Authority
EP
European Patent Office
Prior art keywords
wear
resistant layer
base
grinding table
pulverizer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83109386A
Other languages
German (de)
English (en)
Other versions
EP0107044A3 (en
EP0107044A2 (fr
Inventor
Theodore Vincent Maliszewski, Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Combustion Engineering Inc
Original Assignee
Lummus Crest SARL
Combustion Engineering Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lummus Crest SARL, Combustion Engineering Inc filed Critical Lummus Crest SARL
Publication of EP0107044A2 publication Critical patent/EP0107044A2/fr
Publication of EP0107044A3 publication Critical patent/EP0107044A3/en
Application granted granted Critical
Publication of EP0107044B1 publication Critical patent/EP0107044B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/04—Mills with pressed pendularly-mounted rollers, e.g. spring pressed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/003—Shape or construction of discs or rings

Definitions

  • the present invention relates to the formation of a bull ring having a ductile base and a surface layer with high abrasion resistance. More particularly, the invention relates to a bull ring having a unitary body of high ductility overlayed with an alloy of chromium and carbide forming a contact surface which is highly abrasive resistant.
  • U.S. Patents 2,848,170 and 3,138,337 are selected as representing the terminology and technology of the art of the present invention. Both disclosures illustrate the housing for a bowl mill in which a rotating table is powered by a vertical shaft. Grinding elements in the form of rolls are forced down upon the upper surface of the rotating table by springs, or hydraulic pressure, and coal is fed between the rolls and table surfaces for reducing the size of the coal. Air under pressure is introduced to the housing to remove the coal pulverized to a predetermined size. Routing is provided to regrind that coal not reduced to the desired size.
  • German Patent No. 1,507,580 and U.S. Patent No. 3,186,560 contain teachings which are deemed to be relevant to the subject matter of the present patent application. More specifically, German patent No. 1,507,580 discloses a bull ring for the rotating table of a coal pulverizer with a body of cast steel and Ni-hard alloy. The cast steel is fastened to the upper portion of the rotating table and the Ni-hard alloy is bonded to the upper surface of the cast steel body to form the contact surface with the pulverizing elements of the coal pulverizer.
  • U.S. Patent No. 3,186,560 discloses overlaying a continuous unitary basic body of steel with an alloy which is capable of satisfactorily resisting abrasion while yet not impairing the performance of the steel body as a ductile material.
  • the table, or bowl has its upper surface provided with a working area by a so-called "bull ring".
  • the bull ring structure provides a track which interfaces directly with the surface of the rolls forced downward to bring the surfaces into engagement.
  • the bull ring is exposed to the severe wear of abrasion resulting from crushing or pulverizing coal particles against the roll surface.
  • the art has a long history of concern with the problems and their solutions relating to these bull ring bodies and the surfaces they provide.
  • the bull ring At some point in the early development of the bull ring, it was forged as a unitary body from steel. The strength and ductility of the forged steel bull ring was satisfactory, but its resistance to the wear of abrasion was not.
  • the art moved toward the use of Ni-hard for the single-piece bull ring to improve the resistance to abrasion.
  • Ni-hard is a material well-known to the art as an alloy characterized by its high nickel content.
  • the single-piece Ni-hard bull ring was satisfactorily resistant to the wear of abrasion, but, unfortunately, proved to be unsatisfactorily brittle and, therefore, subject to a breakage from fit-up problems.
  • a pulverizer bull ring which is particularly suited for employment in a pulverizer of the type that is operative to pulverize material that includes a housing, a grinding table having an upper surface embodying a predetermined configuration supported within the housing for rotation relative thereto, drive means supported within the housing in cooperative association with the grinding table so as to be operative to impart rotation to the grinding table, roll means having an outer surface and supported within the housing in juxtaposed relation to the grinding table so as to coact therewith to cause material to be pulverized.
  • the subject pulverizer bull ring comprises a base and a wear-resistant layer of material.
  • the base which is made of cast steel includes an upper surface that embodies a predetermined configuration and a lower surface.
  • the lower surface of the base embodies a configuration complementary to the predetermined configuration of the upper surface of the grinding table.
  • the wear-resistant layer of material includes an upper surface and a lower surface.
  • the lower surface of the wear-resistant layer of material embodies a configuration complementary to the predetermined configuration of the upper surface of the base.
  • the wear-resistant layer of material is bonded to the upper surface of the base by deposit thereon as welding strip material so as to be operative as a contact surface between the grinding table and the roll means.
  • the upper surface of the wear-resistant layer of material which has a width defined by an outer circumference and an inner circumference includes a first portion defined as the area extending from the outer circumference of the upper surface of the wear-resistant layer of material to a point lying substantially midway between the outer circumference and the inner circumference of the wear-resistant layer of material.
  • the second portion is defined as the area extending from a point lying substantially midway between the outer circumference and the inner circumference of the wear-resistant layer of material and the inner circumference of the upper surface of the wear-resistant layer of material.
  • the first portion has an upper surface inclined at an angle so as to mate with the outer surface of the roll means, while the second portion has an upper surface inclined at an angle different than the angle that the upper surface of the first portion is inclined at.
  • the wear-resistant layer of material is formed of a chromium carbide alloy that includes 27.5% chromium, 4.8% carbon, 6.3% manganese and 1.5% silica.
  • Fig. 1 is a sectioned elevation of the major parts of a coal pulverizing mill with a bowl, or table, having a grinding ring embodying the present invention
  • Fig. 2 is a section of the grinding ring of Fig. 1.
  • the rotated bowl, or table, of a coal pulverizing mill is provided with a surface to come into direct contact with the balls, or rolls, which can stand up to the severe service of directly reducing solid coal to the desired size.
  • the surface is provided by a separate grinding ring colloquially referred to as a bull ring.
  • this grinding, or bull ring is in the order of 100" in outside diameter, and provided with a track in the order of 20" wide for direct contact with the rolls.
  • the ground coal, pulverized to the desired size is air- lifted out of the mill.
  • the systems for feeding, recirculating, and air-lifting this solid fuel will not be described in detail.
  • the invention is disclosed as embodied in the construction of the bull ring which is clamped to the rotating table. It is not necessary to disclose the structure with which the bull ring is clamped to the upper surface of the rotating table.
  • the mill has a housing 1 with internal frame members on which is mounted a motor connected to a pinion gear 2 engaging the gears of a vertical shaft 3 on the upper end of which is mounted a bowl, ortable 4.
  • a roll 5 is here disclosed as mounted on a trunnion so that the roll may be forced down upon the surface provided by the table 4.
  • a shoot 6 connects with an outside source of coal to direct the coal from the source to the center of table 4.
  • This solid fuel to be pulverized is centrifugally thrown between the surface of the roll and the surface provided by the invention on the table 4.
  • air entering port 10 is directed upward to lift the particles of coal into exit duct 11.
  • the invention is embodied in the bull ring 12 which is clamped to the upper surface of the rotating table 4.
  • the mating surfaces of the ring and table are fitted with great precision in order that the tremendous pressure of the roll will not overflex the body of the ring and cause its fracture.
  • the basic body of the ring 12 is formed of cast steel in order to provide ductility required of this body, while the upper surface of the ring is provided with an abrasive-resistant material which can withstand the severe service of grinding coal between it and the roll surface.
  • Fig. 2 is simply the bull ring 12 sectioned to disclose a precise relationship between the base of the ring and the overlay material on its upper surface.
  • Base 15 is the cast steel body whose undersurface 16 mates with the upper surface of table 4. On the upper surface of this base 15 there is deposited the abrasion-resistant material which, together with the base, form the unique combination of the invention.
  • the present invention is in the structure of the ring 12 and not the process with which it is formed.
  • the cast steel base 15 has its upper surface covered with an alloy 17 which is preferably 27.5% chromium, 4.8% carbon, 6.3% manganese, and 1.5% silica.
  • This material 17 may be deposited by welding it to the upper surface of the base 15, or it may be sintered thereon in powdered form. However deposited, the material is formed as illustrated in Fig. 2 with a surface 18 angled to mate with the surface of the roll.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Disintegrating Or Milling (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (1)

  1. Dans un pulvérisateur fonctionnant pour pulvériser un matériau, ledit pulvérisateur comportant une cage (1), une table de broyage (4) ayant une surface supérieure présentant une configuration prédéterminée, supportée à l'intérieur de la cage (1) pour tourner par rapport à celleci, des moyens d'entraînement (2, 3) supportés dans la cage (1) et coopérant avec la table de broyage (4) de manière à fonctionner pour entraîner en rotation la table de broyage (4), un rouleau (5) comportant une surface extérieure et supporté dans la cage (1) en étant en juxtaposition par rapport à la table de broyage (4) de manière à coopérer avec celle-ci pour assurer la pulvérisation du matériau et un anneau de broyage de pulvérisateur (12) supporté sur la table de broyage (4) pour tourner avec celle- ci, caractérisé en ce que ledit anneau de broyage de pulvérisateur (12) comporte:
    a) une base (15) en acier coulé, ladite base (15) comportant une surface supérieure présentant une configuration prédéterminée et une surface inférieure (16), ladite surface inférieure (16) de ladite base (15) présentant une configuration complémentaire de la configuration prédétermi-' née de la surface supérieure de la table de broyage (4); et
    b) une couche de matériau (17) résistant à l'usure comportant une surface supérieure et une surface inférieure, ladite surface inférieure de ladite couche de matériau (17) résistant à l'usure présentant une configuration complémentaire de la configuration prédéterminée de ladite surface supérieure de ladite base (15), ladite couche de matériau résistant à l'usure étant fixée à ladite surface supérieure de ladite base (15) en étant déposée sur celle-ci, comme par soudage d'une bande de matériau, de manière à fonctionner comme une surface de contact entre la table de broyage (4) et le rouleau (5), ladite surface supérieure de ladite couche matériau (17) résistant à l'usure ayant une largeur définie par un pourtour extérieur et un pourtour intérieur, ladite surface supérieure de ladite couche de matériau (17) résistant à l'usure comportant une première partie (18) définie comme l'aire s'étendant à partir du pourtour extérieur de ladite surface supérieure de ladite couche de matériau (17) résistant à l'usure jusqu'en un point situé à peu près à mi-chemin entre le pourtour extérieur et le pourtour intérieur de ladite couche de matériau (17) résistant à l'usure, une seconde partie étant définie comme l'aire s'étendant à partir d'un point situé à peu près à mi-chemin entre le pourtour extérieur et le pourtour intérieur de ladite surface supérieure de ladite couche de matériau (17) résistant à l'usure et le pourtour intérieur de ladite surface supérieure de ladite couche de matériau (17) résistant à l'usure, ladite première partie (18) ayant une surface supérieure inclinée suivant un angle de manière à s'accoupler avec la surface extérieure du rouleau (5), ladite seconde partie ayant une surface supérieure inclinée vers la base (16) suivant un angle différent de l'angle d'inclinaison de la surface supérieure de ladite première partie (18), ladite couche de matériau résistant à l'usure étant formée d'un alliage de carbure de chrome qui comporte 27,5 % de chrome, 4,8 % de carbone, 6,3 % de manganèse et 1,5 % de silice.
EP83109386A 1982-10-22 1983-09-21 Anneau de broyage pour broyeur de charbon Expired EP0107044B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US43608982A 1982-10-22 1982-10-22
US436089 1982-10-22

Publications (3)

Publication Number Publication Date
EP0107044A2 EP0107044A2 (fr) 1984-05-02
EP0107044A3 EP0107044A3 (en) 1986-03-12
EP0107044B1 true EP0107044B1 (fr) 1989-02-01

Family

ID=23731069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83109386A Expired EP0107044B1 (fr) 1982-10-22 1983-09-21 Anneau de broyage pour broyeur de charbon

Country Status (9)

Country Link
EP (1) EP0107044B1 (fr)
JP (1) JPS5992038A (fr)
KR (1) KR840006296A (fr)
AU (1) AU567696B2 (fr)
CA (1) CA1235105A (fr)
DE (1) DE3379103D1 (fr)
ES (1) ES526537A0 (fr)
IN (1) IN157719B (fr)
ZA (1) ZA836264B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103468990A (zh) * 2013-09-18 2013-12-25 胡力 用于生产钒氮合金的坯料的生产线

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN166426B (fr) * 1986-02-24 1990-05-05 Combustion Eng
KR100382575B1 (ko) * 2000-09-27 2003-05-01 이영진 미분기의 롤타이어 재생방법 및 재생롤타이어
KR100660569B1 (ko) * 2005-12-15 2006-12-22 한국남동발전 주식회사 분쇄기의 롤러 및 회전판의 보수 방법
KR100799294B1 (ko) * 2007-10-05 2008-01-30 어드벤스드레곤(주) 화력발전소 석탄분쇄용 미분기 화재 감지장치
US9604226B2 (en) 2012-05-01 2017-03-28 Innovative Combustion Technologies, Inc. Pulverizer mill protection system
WO2013166179A1 (fr) 2012-05-01 2013-11-07 Innovative Combustion Technologies, Inc. Système de protection de broyeur pulvérisateur

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848170A (en) * 1953-07-24 1958-08-19 Combustion Eng Wear compensating means for pulverizing mills of the ring-roller type
GB928928A (en) * 1961-04-13 1963-06-19 Mond Nickel Co Ltd Improvements relating to liners for grinding mills
US3138337A (en) * 1963-03-26 1964-06-23 Combustion Eng Pulverizing bowl mill utlizing a segmented bull ring
US3355264A (en) * 1965-02-03 1967-11-28 Canada Iron Foundries Ltd Composite impact and abrasion resistant material
DE1507580A1 (de) * 1966-05-20 1969-04-03 Loesche Kg Verschleissteil,insbesondere Mahlringsegment fuer Waelzmuehlen,Walzenmuehlen,Federrollenmuehlen u.dgl.
FR2492275A1 (fr) * 1980-10-21 1982-04-23 Genot Francois Marteaux de broyage pour broyeurs a ordures menageres
ZA844074B (en) * 1983-05-30 1986-04-30 Vickers Australia Ltd Abrasion resistant materials

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103468990A (zh) * 2013-09-18 2013-12-25 胡力 用于生产钒氮合金的坯料的生产线
CN103468990B (zh) * 2013-09-18 2016-03-09 胡力 用于生产钒氮合金的坯料的生产线

Also Published As

Publication number Publication date
ES8503525A1 (es) 1985-03-01
KR840006296A (ko) 1984-11-29
IN157719B (fr) 1986-05-24
ZA836264B (en) 1984-04-25
AU567696B2 (en) 1987-12-03
EP0107044A3 (en) 1986-03-12
DE3379103D1 (en) 1989-03-09
CA1235105A (fr) 1988-04-12
JPS5992038A (ja) 1984-05-28
ES526537A0 (es) 1985-03-01
AU2049183A (en) 1984-05-03
EP0107044A2 (fr) 1984-05-02

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